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v/vlib/gg/gg.v

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V

// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
module gg
import os
import gx
import sokol
import sokol.sapp
import sokol.sgl
import sokol.gfx
import math
// import time
pub type FNCb = fn (x voidptr)
pub type FNEvent = fn (e voidptr, x voidptr)
pub type FNFail = fn (msg string, x voidptr)
pub type FNKeyDown = fn (c sapp.KeyCode, m sapp.Modifier, x voidptr)
pub type FNMove = fn (x f32, y f32, z voidptr)
pub type FNChar = fn (c u32, x voidptr)
pub struct Config {
pub:
width int
height int
use_ortho bool
retina bool
resizable bool
user_data voidptr
font_size int
create_window bool
// window_user_ptr voidptr
window_title string
borderless_window bool
always_on_top bool
bg_color gx.Color
init_fn FNCb = voidptr(0)
frame_fn FNCb = voidptr(0)
cleanup_fn FNCb = voidptr(0)
fail_fn FNFail = voidptr(0)
event_fn FNEvent = voidptr(0)
keydown_fn FNKeyDown = voidptr(0)
// special case of event_fn
char_fn FNChar = voidptr(0)
// special case of event_fn
move_fn FNMove = voidptr(0)
// special case of event_fn
click_fn FNMove = voidptr(0)
// special case of event_fn
// wait_events bool // set this to true for UIs, to save power
fullscreen bool
scale f32 = 1.0
sample_count int
// vid needs this
// init_text bool
font_path string
custom_bold_font_path string
ui_mode bool // refreshes only on events to save CPU usage
}
pub struct Context {
render_text bool
mut:
// a cache with all images created by the user. used for sokol image init and to save space
// (so that the user can store image ids, not entire Image objects)
image_cache []Image
needs_refresh bool = true
ticks int
pub mut:
scale f32 = 1.0
// will get set to 2.0 for retina, will remain 1.0 for normal
width int
height int
clear_pass C.sg_pass_action
window C.sapp_desc
timage_pip C.sgl_pipeline
config Config
ft &FT
font_inited bool
ui_mode bool // do not redraw everything 60 times/second, but only when the user requests
}
pub struct Size {
pub:
width int
height int
}
fn gg_init_sokol_window(user_data voidptr) {
mut g := &Context(user_data)
desc := sapp.create_desc()
/*
desc := C.sg_desc{
mtl_device: sapp.metal_get_device()
mtl_renderpass_descriptor_cb: sapp.metal_get_renderpass_descriptor
mtl_drawable_cb: sapp.metal_get_drawable
d3d11_device: sapp.d3d11_get_device()
d3d11_device_context: sapp.d3d11_get_device_context()
d3d11_render_target_view_cb: sapp.d3d11_get_render_target_view
d3d11_depth_stencil_view_cb: sapp.d3d11_get_depth_stencil_view
}
*/
gfx.setup(&desc)
sgl_desc := C.sgl_desc_t{}
sgl.setup(&sgl_desc)
g.scale = sapp.dpi_scale()
// NB: on older X11, `Xft.dpi` from ~/.Xresources, that sokol uses,
// may not be set which leads to sapp.dpi_scale reporting incorrectly 0.0
if g.scale < 0.1 {
g.scale = 1.0
}
// is_high_dpi := sapp.high_dpi()
// fb_w := sapp.width()
// fb_h := sapp.height()
// println('g.scale=$g.scale is_high_dpi=$is_high_dpi fb_w=$fb_w fb_h=$fb_h')
// if g.config.init_text {
// `os.is_file()` won't work on Android if the font file is embedded into the APK
exists := $if !android { os.is_file(g.config.font_path) } $else { true }
if g.config.font_path != '' && exists {
// t := time.ticks()
g.ft = new_ft(
font_path: g.config.font_path
custom_bold_font_path: g.config.custom_bold_font_path
scale: sapp.dpi_scale()
) or { panic(err) }
// println('FT took ${time.ticks()-t} ms')
g.font_inited = true
} else {
if !exists {
sfont := system_font_path()
eprintln('font file "$g.config.font_path" does not exist, the system font was used instead.')
g.ft = new_ft(
font_path: sfont
custom_bold_font_path: g.config.custom_bold_font_path
scale: sapp.dpi_scale()
) or { panic(err) }
g.font_inited = true
}
}
//
mut pipdesc := C.sg_pipeline_desc{}
unsafe { C.memset(&pipdesc, 0, sizeof(pipdesc)) }
pipdesc.blend.enabled = true
pipdesc.blend.src_factor_rgb = C.SG_BLENDFACTOR_SRC_ALPHA
pipdesc.blend.dst_factor_rgb = C.SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA
g.timage_pip = sgl.make_pipeline(&pipdesc)
//
if g.config.init_fn != voidptr(0) {
g.config.init_fn(g.config.user_data)
}
// Create images now that we can do that after sg is inited
for i in 0 .. g.image_cache.len {
g.image_cache[i].init_sokol_image()
}
}
fn gg_frame_fn(user_data voidptr) {
mut ctx := &Context(user_data)
if ctx.config.frame_fn == voidptr(0) {
return
}
if ctx.ui_mode && !ctx.needs_refresh {
// Draw 3 more frames after the "stop refresh" command
ctx.ticks++
if ctx.ticks > 3 {
return
}
}
ctx.config.frame_fn(ctx.config.user_data)
ctx.needs_refresh = false
}
pub fn (mut ctx Context) refresh_ui() {
ctx.needs_refresh = true
ctx.ticks = 0
}
fn gg_event_fn(ce &C.sapp_event, user_data voidptr) {
e := &sapp.Event(ce)
mut g := &Context(user_data)
if g.config.event_fn != voidptr(0) {
g.config.event_fn(e, g.config.user_data)
}
match e.typ {
.key_down {
if g.config.keydown_fn != voidptr(0) {
kdfn := g.config.keydown_fn
kdfn(e.key_code, e.modifiers, g.config.user_data)
}
}
.char {
if g.config.char_fn != voidptr(0) {
cfn := g.config.char_fn
cfn(e.char_code, g.config.user_data)
}
}
.mouse_move {
if g.config.move_fn != voidptr(0) {
cfn := g.config.move_fn
cfn(e.mouse_x / g.scale, e.mouse_y / g.scale, g.config.user_data)
}
}
.mouse_down {
if g.config.click_fn != voidptr(0) {
cfn := g.config.click_fn
cfn(e.mouse_x / g.scale, e.mouse_y / g.scale, g.config.user_data)
}
}
else {}
}
}
fn gg_cleanup_fn(user_data voidptr) {
mut g := &Context(user_data)
if g.config.cleanup_fn != voidptr(0) {
g.config.cleanup_fn(g.config.user_data)
}
}
fn gg_fail_fn(msg charptr, user_data voidptr) {
mut g := &Context(user_data)
vmsg := tos3(msg)
if g.config.fail_fn != voidptr(0) {
g.config.fail_fn(vmsg, g.config.user_data)
} else {
eprintln('gg error: $vmsg')
}
}
//
pub fn new_context(cfg Config) &Context {
mut g := &Context{
width: cfg.width
height: cfg.height
config: cfg
render_text: cfg.font_path != ''
ft: 0
ui_mode: cfg.ui_mode
}
g.set_bg_color(cfg.bg_color)
// C.printf('new_context() %p\n', cfg.user_data)
window := C.sapp_desc{
user_data: g
init_userdata_cb: gg_init_sokol_window
frame_userdata_cb: gg_frame_fn
event_userdata_cb: gg_event_fn
fail_userdata_cb: gg_fail_fn
cleanup_userdata_cb: gg_cleanup_fn
window_title: cfg.window_title.str
html5_canvas_name: cfg.window_title.str
width: cfg.width
height: cfg.height
sample_count: cfg.sample_count
high_dpi: true
fullscreen: cfg.fullscreen
}
if cfg.use_ortho {
} else {
}
g.window = window
return g
}
pub fn (gg &Context) run() {
sapp.run(&gg.window)
}
pub fn (mut ctx Context) set_bg_color(c gx.Color) {
ctx.clear_pass = gfx.create_clear_pass(f32(c.r) / 255.0, f32(c.g) / 255.0, f32(c.b) / 255.0,
f32(c.a) / 255.0)
}
// TODO: Fix alpha
pub fn (ctx &Context) draw_rect(x f32, y f32, w f32, h f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_quads()
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.v2f((x + w) * ctx.scale, y * ctx.scale)
sgl.v2f((x + w) * ctx.scale, (y + h) * ctx.scale)
sgl.v2f(x * ctx.scale, (y + h) * ctx.scale)
sgl.end()
}
pub fn (ctx &Context) draw_triangle(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_quads()
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
sgl.v2f(x3 * ctx.scale, y3 * ctx.scale)
sgl.end()
}
pub fn (ctx &Context) draw_empty_rect(x f32, y f32, w f32, h f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_line_strip()
if ctx.scale == 1 {
sgl.v2f(x, y)
sgl.v2f(x + w, y)
sgl.v2f(x + w, y + h)
sgl.v2f(x, y + h)
sgl.v2f(x, y)
} else {
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.v2f((x + w) * ctx.scale, y * ctx.scale)
sgl.v2f((x + w) * ctx.scale, (y + h) * ctx.scale)
sgl.v2f(x * ctx.scale, (y + h) * ctx.scale)
sgl.v2f(x * ctx.scale, y * ctx.scale)
}
sgl.end()
}
pub fn (ctx &Context) draw_circle_line(x f32, y f32, r int, segments int, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
sgl.begin_line_strip()
for i := 0; i < segments + 1; i++ {
theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + x, yy + y)
}
sgl.end()
}
pub fn (ctx &Context) draw_circle(x f32, y f32, r f32, c gx.Color) {
if ctx.scale == 1 {
ctx.draw_circle_with_segments(x, y, r, 10, c)
} else {
ctx.draw_circle_with_segments(x * f32(ctx.scale), y * f32(ctx.scale), r * ctx.scale,
10, c)
}
}
pub fn (ctx &Context) draw_circle_with_segments(x f32, y f32, r f32, segments int, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
sgl.begin_triangle_strip()
for i := 0; i < segments + 1; i++ {
theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + x, yy + y)
sgl.v2f(x, y)
}
sgl.end()
}
pub fn (ctx &Context) draw_arc_line(x f32, y f32, r int, start_angle f32, arc_angle f32, segments int, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
theta := f32(arc_angle / f32(segments))
tan_factor := math.tanf(theta)
rad_factor := math.cosf(theta)
mut xx := f32(r * math.cosf(start_angle))
mut yy := f32(r * math.sinf(start_angle))
sgl.begin_line_strip()
for i := 0; i < segments + 1; i++ {
sgl.v2f(xx + x, yy + y)
tx := -yy
ty := xx
xx += tx * tan_factor
yy += ty * tan_factor
xx *= rad_factor
yy *= rad_factor
}
sgl.end()
}
pub fn (ctx &Context) draw_arc(x f32, y f32, r int, start_angle f32, arc_angle f32, segments int, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
sgl.c4b(c.r, c.g, c.b, c.a)
theta := f32(arc_angle / f32(segments))
tan_factor := math.tanf(theta)
rad_factor := math.cosf(theta)
mut xx := f32(r * math.cosf(start_angle))
mut yy := f32(r * math.sinf(start_angle))
sgl.begin_triangle_strip()
for i := 0; i < segments + 1; i++ {
sgl.v2f(xx + x, yy + y)
sgl.v2f(x, y)
tx := -yy
ty := xx
xx += tx * tan_factor
yy += ty * tan_factor
xx *= rad_factor
yy *= rad_factor
}
sgl.end()
}
pub fn (gg &Context) begin() {
if gg.render_text && gg.font_inited {
gg.ft.flush()
}
sgl.defaults()
sgl.matrix_mode_projection()
sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
}
pub fn (gg &Context) end() {
gfx.begin_default_pass(gg.clear_pass, sapp.width(), sapp.height())
sgl.draw()
gfx.end_pass()
gfx.commit()
/*
if gg.config.wait_events {
// println('gg: waiting')
wait_events()
}
*/
}
fn abs(a f32) f32 {
if a >= 0 {
return a
}
return -a
}
pub fn (ctx &Context) draw_line(x f32, y f32, x2 f32, y2 f32, c gx.Color) {
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
if ctx.scale > 1 {
// Make the line more clear on hi dpi screens: draw a rectangle
mut width := abs(x2 - x)
mut height := abs(y2 - y)
if width == 0 {
width = 1
} else if height == 0 {
height = 1
}
ctx.draw_rect(x, y, width, height, c)
return
}
sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_line_strip()
sgl.v2f(x * ctx.scale, y * ctx.scale)
sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
sgl.end()
}
pub fn (ctx &Context) draw_rounded_rect(x f32, y f32, w f32, h f32, radius f32, color gx.Color) {
sgl.c4b(color.r, color.g, color.b, color.a)
sgl.begin_triangle_strip()
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
r := radius * f32(ctx.scale)
nx := x * f32(ctx.scale)
ny := y * f32(ctx.scale)
width := w * f32(ctx.scale)
height := h * f32(ctx.scale)
segments := 2 * math.pi * r
segdiv := segments / 4
rb := 0
lb := int(rb + segdiv)
lt := int(lb + segdiv)
rt := int(lt + segdiv)
// left top
lx := nx + r
ly := ny + r
for i in lt .. rt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lx, yy + ly)
sgl.v2f(lx, ly)
}
// right top
mut rx := nx + 2 * width - r
mut ry := ny + r
for i in rt .. int(segments) {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rx, yy + ry)
sgl.v2f(rx, ry)
}
// right bottom
mut rbx := rx
mut rby := ny + 2 * height - r
for i in rb .. lb {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rbx, yy + rby)
sgl.v2f(rbx, rby)
}
// left bottom
mut lbx := lx
mut lby := ny + 2 * height - r
for i in lb .. lt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lbx, yy + lby)
sgl.v2f(lbx, lby)
}
sgl.v2f(lx + xx, ly)
sgl.v2f(lx, ly)
sgl.end()
sgl.begin_quads()
sgl.v2f(lx, ly)
sgl.v2f(rx, ry)
sgl.v2f(rbx, rby)
sgl.v2f(lbx, lby)
sgl.end()
}
pub fn (ctx &Context) draw_empty_rounded_rect(x f32, y f32, w f32, h f32, radius f32, border_color gx.Color) {
mut theta := f32(0)
mut xx := f32(0)
mut yy := f32(0)
r := radius * f32(ctx.scale)
nx := x * f32(ctx.scale)
ny := y * f32(ctx.scale)
width := w * f32(ctx.scale)
height := h * f32(ctx.scale)
segments := 2 * math.pi * r
segdiv := segments / 4
rb := 0
lb := int(rb + segdiv)
lt := int(lb + segdiv)
rt := int(lt + segdiv)
sgl.c4b(border_color.r, border_color.g, border_color.b, border_color.a)
sgl.begin_line_strip()
// left top
lx := nx + r
ly := ny + r
for i in lt .. rt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lx, yy + ly)
}
// right top
mut rx := nx + 2 * width - r
mut ry := ny + r
for i in rt .. int(segments) {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rx, yy + ry)
}
// right bottom
mut rbx := rx
mut rby := ny + 2 * height - r
for i in rb .. lb {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + rbx, yy + rby)
}
// left bottom
mut lbx := lx
mut lby := ny + 2 * height - r
for i in lb .. lt {
theta = 2 * f32(math.pi) * f32(i) / segments
xx = r * math.cosf(theta)
yy = r * math.sinf(theta)
sgl.v2f(xx + lbx, yy + lby)
}
sgl.v2f(lx + xx, ly)
sgl.end()
}
pub fn screen_size() Size {
$if macos {
return C.gg_get_screen_size()
}
// TODO windows, linux, etc
return Size{}
}
fn C.WaitMessage()
/*
pub fn wait_events() {
unsafe {
$if macos {
#NSEvent *event = [NSApp nextEventMatchingMask:NSEventMaskAny
#untilDate:[NSDate distantFuture]
#inMode:NSDefaultRunLoopMode
#dequeue:YES];
#[NSApp sendEvent:event];
}
$if windows {
C.WaitMessage()
}
}
}
*/